During Harpeth Hall's first decade, the facilities were expanded to include additional classroom space, an auditorium, gymnasium and cafeteria.

By 2005, significant improvements to facilities were completed including a new library, a track and soccer complex, a visual arts center, and a middle school.

In addition, the following facilities were renovated: the Jack C. Massey Center for Mathematics and Science, George N. Bullard Gymnasium, Frances Bond Davis Theatre, Marnie Sheridan Gallery, and Souby Hall.

[7] Thirteen of Nashville's established private schools, including Harpeth Hall, saw an increase in enrollment after the court decision.

MBA headmaster Francis E. Carter told The Tennessean that black students were welcome, but that none had ever applied, which was typical of private schools in Nashville.

The nucleus of the campus is Souby Hall, which is the administration building and is the original structure present when the land was purchased.

[13] Harpeth Hall collaborates with Montgomery Bell Academy, a school for boys located nearby.

[15] Harpeth Hall students participated in the inaugural year of the Online School, taking classes in Multivariable Calculus, Differential Equations, Computer Programming and Genetics.

The purpose of this program is to increase the number of young women pursuing college degrees and careers in the STEM fields.

[18] In 2011, the school created a strategic partnership with a rural village in Western Kenya's Lwala Province to support girls' education there and to provide service opportunities for Harpeth Hall students.